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elationships between developed susceptibility criteria and available data, and between available data andreality on the ground, need to be examined fully. By evaluating these relationships the modelling process canbe better understood and any uncertainties in the modelling framework can be documented and communicatedto all parties with an interest in assessing the hazard posed by landslides in Ireland.The results clearly highlight the necessity for a comprehensive analysis of the issues involved in susceptibilitymapping raised in this case study. This is particularly relevant in light of the expected role of planning authoritiesand the potential for the development of planning guidance on this matter in the future. Future research in thisarea will be essential in determining the role of regional susceptibility mapping in the development andimplementation of such planning guidance.5.1.7 Recommendations• A full assessment of available national maps and the interrelationships between the classifications usedand those required for susceptibility mapping• Particular focus should be paid to the classification “Peat” as used by the various national maps. Therelationship between the mapped peat categories and their depths should be examined.• On completion of susceptibility rules for mineral soils and rock, these should be incorporated into thesusceptibility mapping effort• Further investigation should consider the issue of run-out areas and how these are accounted for in assessingpotential risk due to landslide hazards.46
5.2. Bréifne Area Landslides Susceptibility MappingXavier PellicerPlate 5.1 Rotational landslide and subsequent rock falls occurring in Cuilcagh Mountains, County Leitrim.5.2.1 IntroductionThe aims of this project were to identify and map landslide occurrences in the Bréifne Area in north-westIreland; to produce a landslide susceptibility map using GIS; and to test a first approach for a methodology forsystematic landslide mapping for the whole of Ireland.The Bréifne Area is located in North West Ireland covering parts of County Sligo, County Cavan and CountyLeitrim in the Republic, and County Fermanagh in Northern Ireland (Fig. 5.10). It covers an area of 3082 km 2 .Due to the lack of readily available datasets such as a DEM and air photographs for County Fermanagh it wasdecided to exclude it from the study area. The final study area therefore covers a total area of 2129.7 km 2 .Fig. 5.10. Bréifne area outlined in red. Location of areas where landslide mapping has beenfocused outlined in purple.47
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Landslides in IrelandGeological Sur
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LANDSLIDESinIRELANDEditorRonnie Cre
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CONTENTSPreface ...................
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Fig. 4.3 Forces caused by water in
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PREFACEUntil recently Ireland has b
Page 11 and 12: een very important in populating th
Page 13 and 14: involves a report on the current st
Page 15 and 16: Main Objectives• Increase public/
Page 17 and 18: 1. INTRODUCTIONRonnie Creighton1.1
Page 19: 1.3 The Landslides PublicationThis
Page 22 and 23: Peat flows are not nearly so well d
Page 24 and 25: In Ireland the Quaternary or uncons
Page 26 and 27: Journal - published papersLetter -
Page 28 and 29: Fig. 3.1 Two images showing the use
Page 30 and 31: Table 3.1 Landslide Events Per Coun
Page 32 and 33: Fig. 3.3 Location map of the Pollat
Page 34 and 35: 3.7.4 Quaternary GeologyQuaternary
Page 36 and 37: 3.8 The Derrybrien Landslide - 2003
Page 38 and 39: • The classification scheme shoul
Page 40 and 41: The force causing the block to slid
Page 42 and 43: Plate 4.1 Herringbone drainage syst
Page 44 and 45: 1210Number of events864Raised bogBl
Page 46 and 47: It is well known by research at Uni
Page 48 and 49: 5. LANDSLIDE SUSCEPTIBILITY MAPPING
Page 50 and 51: Two simplified hypothetical example
Page 52 and 53: 5.1.4 Mapping and GISBy definition,
Page 54 and 55: Platform / sensor pixel resolution(
Page 56 and 57: For this initial run, the criteria
Page 58 and 59: 42Fig. 5.5 Peat and peaty podzols f
Page 60 and 61: for susceptibility mapping purposes
Page 64 and 65: The methodology used to derive the
Page 66 and 67: 50Fig. 5.12. Landslide susceptibili
Page 68 and 69: 52Table 5.6. Landslide classificati
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Page 72 and 73: with slope, overall 20-25% of all e
Page 74 and 75: As the dataset was not available at
Page 79 and 80: CHAPTER 5.2 - TABLE APPENDIXBedrock
Page 81 and 82: 6. LANDSLIDES AND PLANNINGAileen Do
Page 83 and 84: 6.2.4 Development ManagementThe phy
Page 85 and 86: 6.5 Current Practice on Landslides
Page 88 and 89: 7. LANDSLIDES IN NORTHERN IRELANDTe
Page 90 and 91: 2. MudflowsPlate 7.1 Rotational Lan
Page 92 and 93: 7.2 Carboniferous Cliff Lines (Co F
Page 95 and 96: 8. RESEARCH ON IRISH LANDSLIDESKoen
Page 97 and 98: 8.4 Research. Post-2003 AbstractsTa
Page 99 and 100: Identifying, recognizing, and predi
Page 101 and 102: In the case of vulnerability mappin
Page 103 and 104: Steep slopes in glacial tillMichael
Page 105 and 106: 9. RECOMMENDATIONS FOR FUTURE WORK9
Page 107 and 108: Priority 1 Peat slides and peat str
Page 109 and 110: TEXT REFERENCESAcreman, M., 1991. T
Page 111 and 112: Skipper, J., Follett, B., Menkiti,
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APPENDIX 2Glossary of TermsBlanket
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APPENDIX 3Nomenclature for Landslid
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APPENDIX 4101
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Hammond, R. 1979. The Peatlands of
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APPENDIX 7Useful Web Linkswww.gsi.i
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